EP2553987A1 - Synchronisation des transmissions de liaison montante dans un système de communication à porteuses multiples - Google Patents

Synchronisation des transmissions de liaison montante dans un système de communication à porteuses multiples

Info

Publication number
EP2553987A1
EP2553987A1 EP11710216A EP11710216A EP2553987A1 EP 2553987 A1 EP2553987 A1 EP 2553987A1 EP 11710216 A EP11710216 A EP 11710216A EP 11710216 A EP11710216 A EP 11710216A EP 2553987 A1 EP2553987 A1 EP 2553987A1
Authority
EP
European Patent Office
Prior art keywords
downlink
carrier
carriers
selecting
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11710216A
Other languages
German (de)
English (en)
Inventor
Bengt Lindoff
Anders Wallén
Niklas Andgart
Matthias Kamuf
Christian Bergljung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2553987A1 publication Critical patent/EP2553987A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to cellular communication systems, more particularly to multi-carrier communication systems, and even more particularly to the timing of uplink transmissions in a multi-carrier communication system.
  • FIG. 1 is a diagram illustrating a common feature found in most systems: a serving node 101 (depending on the system, it can be called a "base station", a Node B, an evolved Node B (“eNodeB” or “eNB”)) serves user equipment (UE) 103 that is located within the serving node's geographical area of service, called a "cell” 105.
  • a serving node 101 depending on the system, it can be called a "base station”, a Node B, an evolved Node B (“eNodeB” or “eNB”)
  • UE user equipment
  • UE user equipment
  • Communication is bidirectional between the eNB 101 and the UE 103. Communications from the eNB 101 to the UE 103 are referred to as taking place in a "downlink" direction, whereas communications from the UE 103 to the eNB 101 are referred to as taking place in an "uplink” direction.
  • LTE Long Term Evolution
  • IMT- Advanced International Mobile Telecommunications- Advanced
  • bandwidths up to 100 MHz are being discussed.
  • a problem being faced is that the radio spectrum is a limited resource that has to be shared by many operators and systems; this makes it very complicated to find 100 MHz of free contiguous spectrum that can be allocated.
  • FIG. 2 shows an aggregation of two 20 MHz bands 201, 203 and one 10 MHz band 205.
  • the 20 MHz band 203 and the 10 MHz band 205 are contiguous, whereas the 20 MHz band 201 is separated from the 20 MHz and 10 MHz bands 203, 205 by some amount of spectrum 207.
  • the benefit of such a solution is that it becomes possible to generate sufficiently large bandwidths (e.g., 50 MHz in the example of FIG.
  • a multi- carrier LTE system (described below) is one system fulfilling these requirements.
  • a multi-carrier LTE system (described below) is one system fulfilling these requirements.
  • FIG. 3 illustrates one such exemplary system.
  • a serving node 301 serves a UE 303 that is located within the serving node's cell 305.
  • the serving node 301 allocates one chunk of spectrum for use by the UE 303.
  • a second node 307 serves a cell 309 in which the UE 303 is located, and allocates another chunk of spectrum for use by the UE 303.
  • a third node 311 serves a cell 313 in which the UE 303 is located, and allocates yet another chunk of spectrum for use by the UE 303. It is stressed that this is just one of many possible exemplary
  • one, several, or all of the serving nodes can be placed at the same physical location.
  • multi-carrier operation is set up using communication on only one of the carriers in a single- carrier mode.
  • This carrier is often referred to as an anchor carrier, or alternatively as a primary component carrier.
  • Other carriers used in multi-carrier operation are referred to as secondary carriers or secondary component carriers.
  • One important aspect of cellular communication is to keep the uplink and downlink signals synchronized with one another between the eNB and the user equipment.
  • signal modulation is based on Orthogonal
  • Timing advance commands In order to maintain orthogonality between users' signals in the uplink direction, there is a need for so-called timing advance commands to be sent from the network node to the user equipment. Each timing advance command tells its recipient user equipment at what moment it should begin transmitting its signals to the eNB (e.g., this can be expressed as a timing offset from a reference timing system). The need for timing advance commands arises because different user equipments are, in general, distanced from the eNB by different amounts.
  • the user equipments With the propagation delay of a user equipment's signal to the eNB depending on the distance from the eNB to the user equipment, the user equipments generally need to transmit their data at respectively different points in time in order for their transmitted signals to be synchronized with one another at the moment that they arrive at the eNB receiver. (Synchronization of these signals is required in order to enable coherent Fast Fourier Transform (FFT) processing by the eNB's receiver.)
  • FFT Fast Fourier Transform
  • Timing advance for each terminal is estimated by the eNB and timing advance commands are communicated in the downlink signaling to the user equipment, which then can adapt its timing accordingly.
  • a conventional timing advance procedure supporting only single uplink and downlink carriers between the user equipment and the eNB is specified in Release 8 of the specification for LTE systems.
  • the timing advance for the uplink is defined based on the timing of the single reference cell, transmitting on the single downlink carrier that the user equipment is connected to. Operation of a user equipment in a multi-carrier system, however, presents new technical issues that need to be resolved.
  • the foregoing and other objects are achieved in methods, apparatuses, and computer readable storage mediums for operating a user equipment in a multi-carrier communication system, the user equipment comprising a transmitter and a receiver.
  • Such operation comprises operating the receiver to concurrently receive at least two downlink carriers, and receiving, from one or more remote nodes of the multi- carrier communication system, one or more timing advance commands, each of the one or more timing advance commands being associated with a respective one of one or more groups of uplink carriers, each of the groups of uplink carriers comprising at least one uplink component carrier, and each of the groups of uplink carriers being associated with one or more of the received downlink carriers.
  • the following is performed:
  • the transmitter is then controlled to initiate transmission of information on the one or more groups of one or more uplink carriers at an earliest transmission start time of the ascertained transmission time periods and to cease transmission at a latest transmission stop time of the ascertained transmission time periods.
  • there is only one group of uplink carriers and receiving, from the one or more remote nodes of the multi-carrier communication system, one or more timing advance commands comprises receiving only one timing advance command.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting from the at least two downlink carriers a downlink carrier on which the one timing advance command was received.
  • the transmitter comprises only one power amplifier, and controlling the transmitter to initiate transmission of information on the one or more groups of one or more uplink carriers at the earliest transmission start time of the ascertained transmission time periods and to cease transmission at the latest transmission stop time of the ascertained transmission time periods comprises turning on the one power amplifier at the earliest transmission start time of the ascertained transmission time periods and turning off the one power amplifier at the latest transmission stop time of the ascertained transmission time periods.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting a primary/anchor downlink carrier of a cell belonging to an active set.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting a primary/anchor downlink carrier of a cell that is acting as a serving cell for the user equipment.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises ascertaining a level of synchronization reliability of the at least two downlink carriers. Then, a downlink carrier is selected from the at least two downlink carriers based on which one of the carriers has a highest level of synchronization reliability.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting from the at least two downlink carriers a downlink carrier having a first detected downlink path.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting from the at least two downlink carriers a downlink carrier on which the one timing advance command was received.
  • selecting one of the one or more downlink carriers for use as the reference downlink carrier comprises selecting from the at least two downlink carriers a downlink carrier that was used by the user equipment for connection setup.
  • the multi-carrier communication system is a Multi- Carrier Long Term Evolution (MC LTE) system as defined by the 3 GPP.
  • the multi-carrier communication system comprises a first system that is a Multi-Carrier Long Term Evolution (MC LTE) system as defined by the Third Generation Partnership Project (3 GPP) and at least a second system that is not an MC LTE system as defined by the 3 GPP.
  • MC LTE Multi-Carrier Long Term Evolution
  • FIG. 1 is a diagram illustrating a common feature found in most systems: a serving node serving a user equipment that is located within the serving node's geographical area of service, called a "cell".
  • FIG. 2 shows an aggregation of contiguous and non-contiguous portions of radio frequency spectrum.
  • FIG. 3 is a diagram of a system in which multiple nodes concurrently allocate different chunks of radio spectrum for use by a UE.
  • FIG. 4 is, in one respect, a flow diagram of steps/processes carried out in accordance with some embodiments consistent with the invention.
  • FIG. 5 is a block diagram of an exemplary user equipment comprising circuitry for carrying out functionality as illustrated or equivalent to that depicted in FIG. 4.
  • FIG. 6 is, in one respect, a flow diagram of steps/processes carried out in accordance with alternative embodiments involving a plurality of timing advance commands and being consistent with the invention.
  • FIG. 7 is a block diagram of an exemplary user equipment comprising circuitry for carrying out functionality as illustrated or equivalent to that depicted in FIG. 6.
  • circuitry configured to perform one or more described actions is used herein to refer to any such embodiment (i.e., one or more specialized circuits and/or one or more programmed processors).
  • the invention can additionally be considered to be embodied entirely within any form of computer readable carrier, such as solid-state memory, magnetic disk, or optical disk containing an appropriate set of computer instructions that would cause a processor to carry out the techniques described herein.
  • any such form of embodiments as described above may be referred to herein as "logic configured to” perform a described action, or alternatively as “logic that” performs a described action.
  • a user equipment comprising a transceiver including a transmitter and a receiver is employed in a multi-carrier LTE system that is communicating with the user equipment via at least two downlink carriers and at least one uplink carrier.
  • the user equipment receives only a single timing advance command that is applicable to all of the uplink carriers.
  • FIG. 4 which is, in one respect, a flow diagram of steps/processes carried out in accordance with embodiments consistent with the invention.
  • FIG. 4 can alternatively be construed as a block diagram of a user equipment 400 comprising the variously illustrated means for carrying out aspects of these embodiments.
  • the user equipment 400 establishes a connection to a multi- component carrier system, such as a multi-carrier LTE system (e.g., connection to an eNB) or a dual cell HSPA system (step 401).
  • a multi- component carrier system such as a multi-carrier LTE system (e.g., connection to an eNB) or a dual cell HSPA system (step 401).
  • a multi-carrier LTE system e.g., connection to an eNB
  • a dual cell HSPA system step 401
  • the user equipment 400 determines the timing of a reference downlink carrier transmitted by a reference cell (step 403).
  • the reference cell could be any of the following:
  • the reference cell could be any cell transmitting on the reference downlink carrier, such as:
  • an "active set” is, in the context of a WCDMA system, the cells that a UE listens to and decodes information from in case of a soft handover.
  • the timing is typically defined as the first reliable detected path from the reference cell on the reference downlink carrier, and it is typically determined by correlating the received signal to a known signal, like a synchronization or pilot signal (in LTE systems, a primary synchronization or secondary synchronization signal, or the reference signals).
  • a known signal like a synchronization or pilot signal (in LTE systems, a primary synchronization or secondary synchronization signal, or the reference signals).
  • the user equipment then receives the timing advance command from a network node (e.g., eNB) (step 405). Then, based on the downlink timing ascertained from the reference downlink carrier of the reference cell and also on the timing advance command, the transmit timing (e.g., start/stop timing of the transmitter's power amplifier and/or other transmitter related parts of a radio chip) is adjusted, and the information to be transmitted is adjusted according to the timing determination (step 407).
  • a network node e.g., eNB
  • the transmit timing e.g., start/stop timing of the transmitter's power amplifier and/or other transmitter related parts of a radio chip
  • FIG. 5 is a block diagram of an exemplary user equipment 500 comprising circuitry for carrying out functionality as illustrated or equivalent to that depicted in FIG. 4. To facilitate the reader's comprehension of the various aspects in accordance with inventive embodiments, only that circuitry having relevance to the invention is shown. Those of ordinary skill in the art will recognize that other well known circuitry associated with user equipment is also included.
  • Radio frequency signals are received by and transmitted from an antenna 501.
  • a single antenna that is shared for both reception and transmission is illustrated.
  • multiple antennas may be employed for transmission and/or reception, and the receiver and transmitter may or may not share one or more of these antennas.
  • the user equipment 500 For transmitting data, the user equipment 500 includes a modulator 503 that modulates supplied digital data to be transmitted.
  • the modulated data is converted to analog form by a digital-to-analog converter (D AC) 505.
  • D AC digital-to-analog converter
  • the resulting analog signal is supplied to front-end transmitter circuitry (FE TX) 507 which includes, for example, a power amplifier (PA) 509.
  • PA power amplifier
  • the modulator 503 as well as the front-end transmitter circuitry 507 are controlled by a control unit 511.
  • the control unit 511 generates control signals that cause the various circuitry of the user equipment 500 to carry out functions such as those described above with respect to FIG. 4.
  • the control unit 511 can be embodied in any of a number of different forms, no one of which is essential.
  • hardwired logic circuitry can be used.
  • a programmable processor 513 can be programmed with a suitable set of program instructions (e.g., stored in a memory 515) to carry out the desired functionality as described herein.
  • the control unit 511 can be embodied as a mixture of hardwired logic circuitry with a suitably programmed processor 513.
  • radio frequency signals picked up by the antenna 501 are supplied to front-end receiver (FE RX) circuitry 517.
  • the signals on the desired carrier(s) are down converted to analog baseband signals and then converted into digital form by an analog-to-digital converter (ADC) 519.
  • ADC analog-to-digital converter
  • a plurality (1..N) of component carriers CC I ..CC N are supplied in digital form at the output of the ADC 519. These are provided to a detector 521 and to
  • the synchronization circuitry 523 determines the timing of each of the component carriers CC I ..CC N , and supplies this timing information to the detector 521 which is thereby enabled to detect the data carried on each of the component carriers. Detection is performed in any of a number of known ways and therefore need not be described here in greater detail. This detected data is supplied at one or more output ports of the detector 521.
  • the synchronization circuitry 523 also receives information about the downlink reference carrier that enables it to know which of the component carriers CC I ..CC N is the reference downlink carrier.
  • the determination of the reference cell(s)/carrier is performed by a higher layer decoding unit (not shown) and is based on detected data that has been forwarded to higher layer processing circuitry. This enables the synchronization circuitry 523 to supply the timing for the reference downlink carrier 525 to the control unit 511.
  • the detector 521 includes circuitry that extracts the timing advance command from the eNB's downlink signaling and supplies the timing advance command 527 to the control unit 511.
  • the control unit 511 uses the timing for the reference downlink carrier and the timing advance command to ascertain when data transmissions should take place. Based on this ascertainment, the control unit 511 generates control signals (e.g., modulator control signals 529 and transmission start/stop control signals 531 (e.g., which turn the power amplifier(s) on and off) which are supplied to the circuitry being controlled.
  • control signals e.g., modulator control signals 529 and transmission start/stop control signals 531 (e.g., which turn the power amplifier(s) on and off) which are supplied to the circuitry being controlled.
  • a user equipment comprising a transceiver including a transmitter and a receiver is employed in a multi-carrier LTE system that is communicating with the user equipment via at least two downlink carriers and at least one uplink carrier.
  • the user equipment receives a plurality of timing advance commands, each being valid for a respective subset of a plurality of uplink component carriers.
  • each of the timing advance commands is associated with the timing of a respective one of a plurality of reference cells, analogously to the single reference cell providing the single timing advance command in embodiments such as those illustrated by FIGS. 4 and 5.
  • This exemplary embodiment is illustrated in FIG.
  • FIG. 6 which is, in one respect, a flow diagram of steps/processes carried out in accordance with embodiments consistent with the invention.
  • FIG. 6 can alternatively be construed as a block diagram of a user equipment 600 comprising the variously illustrated means for carrying out aspects of these embodiments.
  • the user equipment 600 establishes a connection to a multi- component carrier system, such as a multi-carrier LTE system (e.g., connection to an eNB) or a dual cell HSPA system (step 601).
  • a multi- component carrier system such as a multi-carrier LTE system (e.g., connection to an eNB) or a dual cell HSPA system (step 601).
  • a multi-carrier LTE system e.g., connection to an eNB
  • a dual cell HSPA system step 601
  • the user equipment 600 determines the timing of each reference downlink carrier transmitted by a connected cell that has a related uplink component carrier (step 603).
  • the association between uplink and downlink carriers can be hard coded in the specification (e.g., by means of a fixed duplex distance that applies to all UEs. Alternatively, the association between uplink and downlink carriers can change dynamically, and be obtained by higher layer signaling (e.g., as the message for downlink reference cell/carrier).
  • the timing is typically defined as the first reliable detected path from the reference cell on the reference downlink carrier, and it is typically determined by correlating the received signal to a known signal, like a synchronization or pilot signal (in LTE systems, a primary synchronization or secondary synchronization signal, or the reference signals).
  • a known signal like a synchronization or pilot signal (in LTE systems, a primary synchronization or secondary synchronization signal, or the reference signals).
  • the user equipment then receives the timing advance commands, each associated with a different group of one or more uplink carriers, from a network node (e.g., eNB) (step 605).
  • the timing advance commands can all be received from a serving cell, or alternatively timing advance commands can be received for respective uplinks on respective associated downlink component carriers. In yet other alternatives, timing advance commands can be received according to a specific scheme defined by a communications standard or signaled from the network.
  • the transmit timing (e.g., start/stop timing of the transmitter's power amplifier and/or other transmitter related parts of a radio chip) is adjusted, and the information to be transmitted is adjusted according to the timing determination (step 607).
  • the transmitter chain including the power amplifier is turned on at a time instant corresponding to the earliest downlink carrier timing plus the offset specified by the associated timing advance command, and the transmitter chain and power amplifier are turned off at a time corresponding to the latest downlink component carrier timing plus an offset specified by the associated timing advance command.
  • the respective transmitter chain including the power amplifier is turned on at a time instant corresponding to the respective earliest downlink component carrier timing plus an offset specified by the associated timing advance command, and the respective transmitter chain and power amplifier is turned off at a time corresponding to the respective latest downlink carrier timing plus an offset specified by the associated timing advance command.
  • FIG. 7 is a block diagram of an exemplary user equipment 700 comprising circuitry for carrying out functionality as illustrated or equivalent to that depicted in FIG. 6. To facilitate the reader's comprehension of the various aspects in accordance with inventive embodiments, only that circuitry having relevance to the invention is shown. Those of ordinary skill in the art will recognize that other well known circuitry associated with user equipment is also included.
  • Radio frequency signals are received by and transmitted from an antenna 701.
  • a single antenna that is shared for both reception and transmission is illustrated.
  • multiple antennas may be employed for transmission and/or reception, and the receiver and transmitter may or may not share one or more of these antennas.
  • the user equipment 700 For transmitting data, the user equipment 700 includes a modulator 703 that modulates supplied digital data to be transmitted.
  • the modulated data is converted to analog form by a digital-to-analog converter (DAC) 705.
  • the resulting analog signal is supplied to front-end transmitter circuitry (FE TX) 707 which includes, for example, a power amplifier (PA) 709.
  • PA power amplifier
  • the modulator 703 as well as the front-end transmitter circuitry 707 are controlled by a control unit 71 1.
  • the control unit 71 1 generates control signals that cause the various circuitry of the user equipment 700 to carry out functions such as those described above with respect to FIG. 6.
  • the control unit 71 1 can be embodied in any of a number of different forms, no one of which is essential.
  • hardwired logic circuitry can be used.
  • a programmable processor 713 can be programmed with a suitable set of program instructions (e.g., stored in a memory 715) to carry out the desired functionality as described herein.
  • the control unit 71 1 can be embodied as a mixture of hardwired logic circuitry with a suitably programmed processor 713.
  • radio frequency signals picked up by the antenna 701 are supplied to front-end receiver (FE RX) circuitry 717.
  • the signals on the desired carrier(s) are down converted to analog baseband signals and then converted into digital form by an analog-to-digital converter (ADC) 719.
  • ADC analog-to-digital converter
  • a plurality (1..N) of component carriers CC I ..CC N are supplied in digital form at the output of the ADC 719. These are provided to a detector 721 and to
  • the synchronization circuitry 723 determines the timing of each of the component carriers CC I ..CC N , and supplies this timing information to the detector 721 which is thereby enabled to detect the data carried on each of the component carriers. Detection is performed in any of a number of known ways and therefore need not be described here in greater detail. This detected data is supplied at one or more output ports of the detector 721.
  • the synchronization circuitry 723 also receives information about the downlink reference carriers having associated uplink carriers. This enables the synchronization circuitry 723 to know which of the component carriers CC I ..CC N will be used for ascertaining timing information, which in turn enables the synchronization circuitry 723 to supply the timing for the reference downlink carriers 725 to the control unit 711.
  • the determination of the reference cell(s)/carrier having an associated uplink carrier is performed by a higher layer decoding unit (not shown) and is based on detected data that has been forwarded to higher layer processing circuitry.
  • the detector 721 includes circuitry that extracts the timing advance commands associated with respective downlink carriers and supplies the timing advance commands 727 to the control unit 711.
  • the control unit 711 uses each of the timings for the reference downlink carriers and the associated timing advance commands to ascertain when data transmissions should take place. Based on this ascertainment, the control unit 711 generates control signals (e.g., modulator control signals 729 and transmission start/stop control signals 731 (e.g., which turn the power amplifier(s) on and off) which are supplied to the circuitry being controlled.
  • control signals e.g., modulator control signals 729 and transmission start/stop control signals 731 (e.g., which turn the power amplifier(s) on and off) which are supplied to the circuitry being controlled.
  • Embodiments in accordance with aspects of the invention define the operation of timing advance in a multi-component carrier system. This makes it possible to keep the user equipment's uplink signals synchronized in multi-carrier systems.
  • the above-described embodiments have been presented from the perspective of UE operation in a multi-carrier communication system that operates in accordance with one standard (e.g., a Multi-Carrier Long Term Evolution (MC LTE) system as defined by the Third Generation Partnership Project (3GPP)).
  • MC LTE Multi-Carrier Long Term Evolution
  • 3GPP Third Generation Partnership Project
  • the multi-carrier communication system in which the UE operates actually comprises a plurality of different systems, such as a first system that is a Multi-Carrier Long Term Evolution (MC LTE) system as defined by the 3 GPP and at least a second system that is not an MC LTE system as defined by the 3 GPP.
  • MC LTE Multi-Carrier Long Term Evolution

Abstract

La présente invention se rapporte à un terminal qui comprend un émetteur et un récepteur, fonctionne dans un système de communication à porteuses multiples et reçoit au moins deux porteuses de liaison descendante. Une ou plusieurs commandes d'avance de synchronisation sont reçues, chacune étant associée à un groupe d'une ou de plusieurs porteuses de liaison montante, chaque groupe étant associé à une ou plusieurs des porteuses de liaison descendante reçues. Pour chaque porteuse de liaison descendante associée à l'un des groupes de porteuses de liaison montante, une porteuse de liaison descendante est sélectionnée en tant que porteuse de liaison descendante de référence; la synchronisation de porteuse de liaison descendante de référence est établie; et une période de temps de transmission est déterminée sur la base de la synchronisation de la porteuse de liaison descendante de référence et d'un décalage spécifié par la commande d'avance de synchronisation associée au groupe de porteuses de liaison montante. La période de temps de transmission comprend une heure de début et une heure de fin. La transmission est établie à partir d'une heure de début de transmission le plus tôt parmi les périodes de temps de transmission établies et se termine à une heure d'arrêt déterminée la plus tardive.
EP11710216A 2010-03-31 2011-03-28 Synchronisation des transmissions de liaison montante dans un système de communication à porteuses multiples Withdrawn EP2553987A1 (fr)

Applications Claiming Priority (4)

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US31931810P 2010-03-31 2010-03-31
US33188310P 2010-05-06 2010-05-06
US12/869,693 US20110243111A1 (en) 2010-03-31 2010-08-26 Timing of Uplink Transmissions in a Multi-Carrier Communication System
PCT/EP2011/054708 WO2011120910A1 (fr) 2010-03-31 2011-03-28 Synchronisation des transmissions de liaison montante dans un système de communication à porteuses multiples

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EP (1) EP2553987A1 (fr)
JP (1) JP5784697B2 (fr)
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WO (1) WO2011120910A1 (fr)

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